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| PC Power Supply Discussion Troubleshooting and discussion of computer power supplies |
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#1
04-24-2012
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Plastic sheets that cover half the fan: why?
I've seen a number of powersupply designs with 120mm+ fans with a clear plastic sheet covering as much as half the fan.
Why? Optimizing turbulence? Do some components like to run hotter? WHY?! I MUST KNOW THE SECRET! 
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#2
04-24-2012
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Blocking the air in that regions causes a low pressure area, which forces the air through the PSU in an L-shape and out the rear of the PSU. It's basically done as a cheap and easy way to direct airflow in a PSU.
A lot of higher-end units do it less often and if they do it, they do it in smaller areas now. It was a lot more common a little while ago.
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www.corsair.com Personal rig: 3770k in a Sabertooth Z77 with an EVGA Classified 680 - Corsair Dominator Platinum 16GB - Corsair Neutron GTX 240GB SSD - Corsair AX1200i PSU - Corsair H100 Cooler - Corsair C70 Case - Corsair Air Series Fans - Corsair K60 - Corsair M60 - Corsair SP2500 speakers - Beyerdynamic DT990 Custom Headphones
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#3
04-24-2012
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As Redbeard said, it's to direct the airflow, otherwise up to half the air from the fan would go straight out the back of the PSU instead of working to cool it.
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Intel i7-2600k with an XSPC Raystorm water block, 4x4GB Corsair Dominator, SLi Evga-GTX560Ti-448 FTWs, Asrock Extreme4 Gen3, Crucial M4 256GB SSD, Samsung Spinpoint F3 1TB HDD, powered by a Silverstone Strider+ 850 PSU in a Silverstone TJ-07BW case. I'm not buying EK GPU blocks ever again. (One GPU killed)
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#4
04-24-2012
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Thank you. That makes sense.
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